title: Effectiveness and pathways of electrochemical degradation of pretilachlor herbicides.
abstract: Pretilachlor used as one kind of acetanilide herbicides is potentially dangerous and biorefractory. In this work, electrochemical degradation of lab-synthetic pretilachlor wastewater was carried out with Sb doped Ti/SnO(2) electrode as anode and stainless steel as cathode. The effect of current density on pretilachlor degradation was investigated, and the degradation pathway of pretilachlor was inferred by analyzing its main degradation intermediates. The results showed that the removal of pretilachlor and TOC in treatment time of 60 min were 98.8% and 43.1% under the conditions of current density of 20 mA cm(-2), initial concentration of pretilachlor of 60 mg L(-1), Na(2)SO(4) dosage of 0.1 mol L(-1), pH of 7.2, respectively, while the energy consumption was 15.8 kWhm(-3). The main reactions for electrochemical degradation of pretilachlor included hydroxylation, oxidation, dechlorination, C-O bond and C-N bond cleavage, resulting in the formation of nine main intermediates.
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China. wjz0451@yahoo.com.cn
authors.forename: Jinzhi
authors.initials: J
authors.lastname: Wei
authors.forename: Yujie
authors.initials: Y
authors.lastname: Feng
authors.forename: Xiaojun
authors.initials: X
authors.lastname: Sun
authors.forename: Junfeng
authors.initials: J
authors.lastname: Liu
authors.forename: Limin
authors.initials: L
authors.lastname: Zhu
mesh_terms: D000083:Acetanilides / Q000737:chemistry*; D055664:Electrochemical Techniques / Q000379:methods*; D004566:Electrodes; D006540:Herbicides / Q000737:chemistry*; D007700:Kinetics; D010084:Oxidation-Reduction; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D000083:Acetanilides; D006540:Herbicides; D014874:Water Pollutants, Chemical; C118050:pretilachlor